Are you taking about the pre-boot password, or the Windows password?
Sorry, this si the preboot password.
I can't see how what you describe is possible - the pre-boot is the same whether you cold boot or hibernate - There's no way it can accept password A during a boot, and then password B after hibernating, unless password B also works on subsequent boots.
Syncing the windows password into pre-boot is not dependant on any EPO activity. It happens straight away (or not).